There are 2 posts on this date.
On 18 July 1817, Georg Anton Schäffer was forced off Kauai after trying to seize the Hawaiian islands for the Russian-American Company. Everyone remembers Alaska. Almost nobody remembers how close Russia came to a Pacific enclave.
On 18 July 1566, Bartolomé de las Casas died in Madrid after fifty years spent prosecuting Spain's own conquest. He had begun as an encomendero in Hispaniola, and he never stopped being inconvenient - then to the colonists, now to almost everyone who tries to claim him.